172369

Appears in sequences

• Strong pseudoprimes to base 11.at n=32A020237
• Denominators of continued fraction convergents to sqrt(87).at n=6A041155
• Denominators of continued fraction convergents to sqrt(348).at n=14A041659
• Denominators of continued fraction convergents to sqrt(783).at n=6A042511
• Generalized Markoff numbers: largest number a in a 5-tuple a >= b >= c >= d >= e satisfying the Markoff(5) equation a^2 + b^2 + c^2 + d^2 + e^2 = 4*a*b*c*d*e.at n=22A229241
• Number of (n+3)X(3+3) 0..1 arrays with each row and column divisible by 13, read as a binary number with top and left being the most significant bits.at n=9A262484